Vattenfall is seeking a company to replace array cables at the 288MW Dan Tysk offshore wind farm in the German North Sea.
The tender document indicates that Vattenfall intends to enter into a single contract for the work, which also includes design, supply and installation of a cable protection system (CPS).
The Swedish developer said the work is needed after it carried out a remote operated vehicle survey of the wind farm that revealed “anomalies at the inter-array cables (IAC) and cable protection system”.
It said: “Vattenfall desires to conduct a proactive IAC repair campaign to mitigate the risk of future cable failures.
“The mitigation measures include the replacement of inter-array-cables and CPS as well as the stabilisation of CPS by covering them partly with rocks, rock-bags or mattresses.”
Between 13 to 24 cables will be replaced, with stabilisation required for 100 to 125 cable-ends/CPS, the company added.
Work is intended to be executed starting between March and May 2021, Vattenfall said.
Interested parties have until midday local time on 4 September to apply.
Dan Tysk features 80 Siemens Gamesa 3.6-120 turbines and has been fully operational since April 2015.